Delphi ES20051 Oxygen Sensor - Center, Front Left, Rear or Rear Left

Delphi ES20051 Oxygen Sensor Overview

The Delphi ES20051 is a heated oxygen sensor built for precise exhaust feedback in select Cadillac, Chevrolet, and Pontiac applications. It combines OE-based engineering with a 4-wire design, square connector, and 18 x 1.5 mm thread size for direct replacement service on the listed positions.

Compatible With 1996-2002 Cadillac DeVille, Eldorado, and Seville, plus 1998-2002 Chevrolet Camaro and Pontiac Firebird applications in the positions shown below. The Delphi ES20051 is also referenced by part number ES20051 for easy catalog matching.

Key Features

• Heated oxygen sensor for faster operating temperature and stable signal output
• 4-wire configuration for the listed vehicle applications
• Square connector shape for OE-style electrical connection
• 18 x 1.5 mm thread size for proper exhaust bung fitment
• Overall length: 425.0
• Includes oxygen sensor and instruction sheet
• OE heritage backed by Delphi’s long history supplying original equipment to major automakers

Detailed Description

Delphi ES20051 is an emission control sensor engineered for vehicles that rely on accurate oxygen content readings to manage fuel delivery and emissions performance. Delphi draws on more than a century of OE experience, and that background is reflected in the sensor’s construction, connector design, and application coverage. This part number ES20051 is used across multiple rear, front left, rear left, and center positions depending on the vehicle.

Fits 2000-2002 Chevrolet Camaro, Rear. Fits 1998-2002 Chevrolet Camaro, Front Left. Fits 2000-2002 Pontiac Firebird, Rear. Fits 1998-2002 Pontiac Firebird, Front Left. Fits 1996-1999 Cadillac DeVille, Rear. Fits 1996-1999 Cadillac Eldorado, Rear. Fits 1996-1999 Cadillac Seville, Rear. Fits 1998-1999 Chevrolet Camaro, Rear Left. Fits 1998-1999 Pontiac Firebird, Rear Left. Fits 1996-1998 Cadillac DeVille, Center. Fits 1996-1998 Cadillac Seville, Center. Fits 1996-1997 Cadillac Eldorado, Center.

This part cross-references Bosch 13444 and DENSO Auto Parts 234-4025 for the same application.

What It Helps Address

• Fault codes related to oxygen sensor response or signal performance
• Rough idle or inconsistent air-fuel control caused by a worn sensor
• Increased emissions from inaccurate exhaust feedback
• Fuel trim issues tied to aging upstream or downstream sensor operation
• Replacement needs for damaged connector, wiring, or sensor element wear

Installation Notes and Tips

Verify the exact position on your vehicle before ordering, since ES20051 is used in center, front left, left, rear, and rear left locations depending on application. Confirm the connector shape, wire count, and thread size against the original sensor before installation. Inspect the exhaust bung threads and wiring routing during replacement to ensure a secure fit and proper harness clearance.

Quality Assurance

Delphi builds aftermarket parts using OE heritage and technical knowledge developed through long-term supplier relationships with major automakers. That OE-based approach supports consistent fitment and sensor performance for the listed Cadillac, Chevrolet Camaro, and Pontiac Firebird applications.